Prevent infinite recursion on cyclic brig redirect (#10705)

Prevent infinite recursion when declaring a cyclic relation between
command nodes via child nodes redirecting to an nth parent by marking a
command node as unwrapped before unwrapping its children.

patches/server/Brigadier-based-command-API.patch

@@ -401,6 +401,10 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +            throw new IllegalArgumentException("Unknown command node passed. Don't know how to unwrap this.");
 +        }
 +
++        // Store unwrapped node before unwrapping children to avoid infinite recursion in cyclic redirects.
++        converted.wrappedCached = pureNode;
++        pureNode.unwrappedCached = converted;
++
 +        /*
 +        Add the children to the node, unwrapping each child in the process.
 +         */
@@ -408,9 +412,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +            converted.addChild(this.unwrapNode(child));
 +        }
 +
-+        converted.wrappedCached = pureNode;
-+        pureNode.unwrappedCached = converted;
-+
 +        return converted;
 +    }
 +